On the trip, closed to other media, the two leaders declared work on the first reactor at Barakah complete.

The $20 billion nuclear plant is Seoul's first attempt to build an atomic reactor abroad. The first of its four reactors, being built in the UAE's western desert near the Saudi border, is scheduled to come online this year, making it the first nuclear power plant on the Arabian Peninsula.

Moon was scheduled to attend a cultural event Monday night in Abu Dhabi.